Connect bypass humidifier to Ecobee 3 thermostat

I just purchased the ecobee 3 and love it so far. I'd like to add my whole house bypass humidifier to the mix but it isn't wired like any of the diagrams supplied that I can tell.

My Bryant furnace model 340aav048100absa is connected directly to my Lennox Healthy Climate HCWB3-17 bypass humidifier without being connected to the ecobee 3 but instead a humidistat. My furnace is currently connected to the ecobee 3 with the conventional heat and cool diagram in the ecobee manual.

Furnace is connected to humidifier as follows:

-Red wire from furnace board COM 24V gets connected directly to humidistat and from there runs to a yellow wire on the humidifier
-White wire from furnace board goes directly to a second yellow wire on the humidifier
-(There is also a float with a switch from the drain pan wired into the yellow wires from humidifier)
-No other wires exist

I've included my simple drawing of the wiring from furnace to humidifier and a picture of the wiring on my furnace board. Also included a picture of the aforementioned standard wiring.

Please provide help on the proper method of wiring the ecobee 3 to the humidifier and removing the humidistat. I also have 3 unused wires by the ecobee and by the furnace that can be used. Any help is greatly appreciated!!!!

Remove the humidifier wire from W.
Connect it to one unused wire that go to the stat.
Connect that wire at the stat to ACC+. (there is no polarity to humidifier)
If not needed..... bypass old humidistat.
Program the stat for one wire accessory.

Not sure if you figured this out, yet, I went through this myself recently... hope this helps.

The way my humidifier and humidistat was wired looks similar to yours. I was just short on extra wires, so here’s what I did:

1.) I used my C wire at the thermostat (Ecobee3) and moved it to my Acc+.
2.) My humidifier solenoid was already wired to my furnace to the C (24V) and the W (Heat call).

a. Just had to cut old wires from the original humidistat way at the solenoid.

3.) I installed the PEK (power extender kit) to free up the old C wire at the furnace
4.) Attached the old C wire, now Acc+ to either wire (doesn’t matter which one) from the humidifier
5.) Left the other wire from the humidifier to the C (24V)... so yes, you do need power to the solenoid
6.) Setup Ecobee3 for humidifier operation… done.

Thank you Pete and itsnot! I've got it figured out. Fortunately, I had extra wire so I am simply running one wire from humidifier to ecobee3 in ACC+ and one wire from humidifier back to furnace board in COM 24 VAC. This seems to have solved everything. Now all I need is for the humidifer to catch up.

Correct me if I'm wrong:
1. Connect one wire from the Humidifier Solenoid to COM 24 VAC(probably already connected)
2. Connect the other wire from the Humidifier Solenoid to a wire going to the the Ecobee. This wire will go into ACC+ on Ecobee
3. Cut the wires from the Humidifier Solenoid to the Humidistat so it will no longer use it.

Thanks for all the good and clear info so far everyone. Planning my Ecobee install right now, and this was one of my priorities, to get the humidifier control integrated.

In itsnot's New diagram and the method that is described having the 1st wire from the solenoid to the furnace board (COM 24 VAC), and the 2nd wire from the solenoid to the Ecobee ACC+ location - is it then considered a 1 wire configuration (for the purpose of programming the ecobee), vs the 2 wire in the original post?

Hi All! I'm new to the forum. I have this exact setup as I have a separate humidistat that only activates the solenoid valve when the heat is pumping, therefore, I cannot achieve the humidity I want. In order to have the Ecobee3 to control the humidity, I would have to bypass my current humidistat and have one end of the solenoid valve to connect to the ACC+ on the Ecobee3. My question is: can this be done without any extra wires? I have an older home and setup that only have a 4 wire setup from the thermostat to the furnace so I had to use the PEK to even get the Ecobee3 to work. Currently there are 2 wires going from my humidistat to my furnace, one red wire is clipped strait in to a lead on the board called "HUM" and the other is a white wire going to the 24v COMM. My furnace is a Carrier Weather Maker 9200.

In all the drawings in this post there is no humidistat shown in the schematics. Can it be disconnected all together? Currently the humidistat is near the blower. I do have a spare line running from the stat to the furnace that I can connect to the ACC+ but I dont understand step 4 where itsnot states:
4.) Attached the old C wire, now Acc+ to either wire (doesn’t matter which one) from the humidifier.

Which wire is he referring to?

I've got two wires from the humidistat and two from the humidifier. One of the Humidifier wires stays connected to the C on the furnace board and the second connects to a prong on the board that actually states 'HUM' instead of the 'G C W Y R' section of the board.

Sorry for the disjointed message. Any help would be greatly appreciated.

I've got two wires from the humidistat and two from the humidifier. One of the Humidifier wires stays connected to the C on the furnace board and the second connects to a prong on the board that actually states 'HUM' instead of the 'G C W Y R' section of the board.

The one humidifier wire stays right on the C connection.
The other lead gets removed from the "HUM" terminal and gets re-connected to ACC+.

I thought I would resurrect this post to see if I can get some advice on hooking up my Aprilaire 600 humidifier to my Ecobee 3.

My Ecobee 3 is connected to a PEK as I did not have a C wire from the original thermostat.

The Aprilaire is currently wired as follows:

Black and white wires from the solenoid to the manual humidifier controller, where the black wire is connected to this controller. From the controller the black wire is connected to the R furnace terminal and the white wire is connected to the C furnace terminal. This has been my setup before getting my Ecobee 3.

Can someone please provide me with directions on how to connect my Aprilaire 600 so that my Ecobee 3 is the humidifier controller vs the old manual controller?

The PEK will not support the humidifier connection.
Time to replace the stat cable to one with more conductors.

Connecting the humidifier to R and C means that the humidifier will always run if the humidistat tells it to. That is not an ideal setup. The furnace needs to be in heat mode before the humidifier operates.

I have read through all the comments already and most of it is somewhat confusing to me but I get some of it. My question has probably already been answered but just not in a way that makes since to me.

I have the Ecobee3 hooked up already using a 5 wire setup. I just got my Aprilaire 600 and can do everything but the wiring. I will attach some pics if that helps but what wires from the humidifier should I run to the furnace and where should they be hooked up at so I can have the Ecobee run the humidifier? Also, a transformer was included with the humidifier, does that need to be used or can I disregard it with the set up I have.

Thank you very much in advance for whoever can help me and my wife’s dry skin will thank you too.

You have an extra brown wire in your thermostat cable.
Connect it to ACC+ at the stat.
At the furnace end... connect that brown wire to one of the solenoid wires.
Connect the other solenoid wire to C at the furnace where white and blue are connected.
You will have three wires on the C terminal.

You don't need the transformer.
Program the stat for 1 wire humidifier with heat.

I have everything setup the same as Post 2, but without the Y wire. As I understand it, the Y wire would be used for an air conditioning setup, but I don't have an air conditioner. Should this same setup work without the Y wire or is there another configuration I should be using? The humidifier currently doesn't work as setup.

I can see by the amount of page views that this is a hot topic. Once an older thread grows to this size it's sent to the archives where it can always be searched and viewed. If you have a further question that is not addressed here or need more help.... please feel free to start a new thread and we'll take care of it there.